(Mathematica function used in the implementation)

BakeIt[image_] := Module[

  {slice1, slice2, im = image, imDim, theSide},
  imDim = ImageDimensions[im];
  If[imDim1 == imDim2,
   (im = ImageResize[im, Round[imDim1, 2]*{1, 1}];
    theSide = Round[imDim1, 2];
    slice1 = 
     ImageResize[
      ImageTake[im, {1, theSide}, {1, theSide/2}], {theSide, 
       theSide/2}];
    slice2 = 
     ImageReflect[
      ImageResize[
       ImageTake[
        im, {1, theSide}, {1 + theSide/2, theSide}], {theSide, 
        theSide/2}], Left -> Right];
    ImageAssemble[{{slice2}, {slice1}}])
   ]
  ];

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